Refer to the exhibit. SW1 and SW2 are connected to routers R1 and R2 via their L2 trunk ports. Which command can you enter on the switches to allow the hosts on VLAN 20 to join the multicast group 239.10.10.10 via the upstream L2 ports?
A. ip igmp snooping querier 239.10.10.10
B. ip igmp snooping vlan 20 mrouter learn cgmp
C. ip igmp snooping vlan 20 static 239.10.10.10 interface gigabitethernet0/0
D. ip igmp snooping vlan 20 mrouter interface gigabitethernet0/0
